(1)1-2/1-20/1-200/1-2000/1-20000/1-200000/1

问题描述:

(1)1-2/1-20/1-200/1-2000/1-20000/1-200000/1
(2)99又4/3+199又4/3+2999又4/3+39999又4/3+1

(1)1-2/1-20/1-200/1-2000/1-20000/1-200000/1
=(200000-100000-10000-1000-100-10-1)/200000
=(200000-111111)/200000
=89999/200000
(2)99又4/3+199又4/3+2999又4/3+39999又4/3+1
=(100+200+3000+40000)-1/4×4+1
=43300